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Learn the basics of algebra with a free introductory course on variables and equations at Khan Academy.
In algebra, a symbol (usually a letter) standing in for an unknown numerical value in an equation or an algebraic expression. In simple words, a variable is a quantity that can be changed and is not fixed.
A variable is a letter representing some unknown; a variable always represents a number, but it carries varying values when written in an expression. By convention, mathematicians usually assign letters (not mandatory) at the end of the alphabet (such as x, y, and z) to be variables.
http://www.greenemath.com/In this lesson, we will explore the first question of algebra, which is to ask: What is a variable? We will then move into algebrai...
A variable can be described in many ways, but generally, we describe a variable as a box, container, or placeholder for an unknown value. A variable can be represented with any symbol we would like, however, in algebra the lowercase letters x,y, and z are most common.
Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values. For example, when calculating total earnings at a job with an hourly wage plus tips, a variable can represent the fluctuating tips, making it easier to determine total income.
What is a Variable in Math? How do we use Variables in Algebraic Expressions? Learn how to work with variables, and simplify Algebraic Expressions in our Step by Step Tutorial.
